Sean McKeever, at least according to Rich Johnson. Since everyone has been clamoring for Grativty to join the Warriors, I have a feeling that we're going to see one of Marvel's newest heroes get a chance with the team book.

McKeever also wrote the most recent Inhumans miniseries that had some representatives of the group go to college. Between this and the college aged Gravity, I'm going to assume that this will be more of a college age book, with Gravity, probably someone from the the Inhumans book, and most likely Firestar as the last member of the original team.